Clutch.



PATENTBD AUG. 18, 1903.

C. L. GROHMANN.

CLUTCH.

APPLIGATION FILED APB. 24, 190s.

3 SHEETS-SHEET 1.

N0 MODEL.

. L Gro/r, waan/z,

PATENTED AUG. 18, 1903. C. L. GROHMANN.

CLUTCH.

APPLIOATION FILED APB. 24. 1903.

3 SHEETB-SHEETZ.

N0 MOBIELA v PATBNTED AUG. 18, 1903.

C. L. GROHMANN.

CLUTCH. APPLICATION FILED A PB. 24,1903,

3 SHEETS-SHEET 3.

N0 MODEL.

Patented August 18, 1903.

PATENT OFFICE.

CARL L. GROIIMANN, OF NFV YORK, N. Y., ASSIGNOR TO DOW'` COMPOSING MACHINE COMPANY, A CORPORATION OF NEW YORK.

CLUTCH.

SPECIFICATION forming part of Letters Patent No. 736,517, dated August 18, 1903. Application led April 24, 1903. Serial No. 154,160. (No model.)

To @ZZ whom t 7mo/,y concern:

Be it known that 1, CARL L. GROHMANN, a citizen of the United States of America, and a resident of New York city, county and State of New York, have invented certain new and useful Improvements in Clutches, of which the following is a specification.

My invention relates to certain new andl useful improvements in clutches, and has for 1o its object to produce a clutch which may be thrown out at the end of a single or a plurality of revolutions to stop the rotation of the shaft on which the clutch is mounted at substantially the same point in the revolution of the shaft. This stopping is effected without jar or pounding, and the parts are easily and quietly brought to rest at substantially the same point no matter what the momentum of the shaft may be. zo Referring to the drawings, wherein like parts are designated by the same numerals wherever they appear, Figure 1 is a face view of a clutch embodying my invention with parts broken away to more clearly show the construction. Fig. 2 is a view taken at right angles to Fig. 1 with parts broken away, the mechanism in both Figs. 1 and 2 being shown in normal position. Fig. 3 is a front view of the clutch-lever, showing the position of the lever at the time the clutch is thrown in. Fig. A1 is a View similar to Fig. 3, showing the lever after it has been returned to its normal position. Fig. 5 is a view similar to Fig. 4, showing the lever in its position when the clutch is being thrown out. Fig. 6 is a perspective view of the clutch-lever block. Fig. 7 is a perspective view of the clutch-bolt. Figs. 8 to 17, inclusive, show the clutch-bolt and lever-block in the different positions 4o which they assume with relation to each other during the operation.

In the particular form of invention shown in this application the mechanism is such that the clutch will be thrown out after it has made a single revolution. It is to be understood, however, that by slightly modifying the construction the clutch-lever may be held out so that the clutch can be used to operate for as many revolutions as desired; but no matter what the number of revolutions be the clutch will always be stopped at the coinpletion of a revolution.

1 designates a shaft which is adapted to be driven through the clutch.

2 is a hub secured to the shaft 1 and hav- 55 ing on one end the disk 3 and on the other end the Iiange 4, which is cut away for about one hundred degrees, and on the inner side the radial edge of the flange at one side of the cut is beveled to form a shearing-cam. 6o The disk 3 carries a clutch-bolt 5, which when released is adapted to engage one of the teeth of a toothed wheel 6 and throw the clutch into operation. The toothed wheel 6 is secured to a gear 7 by means of dowel-pins 8 65 and the screws 9. The gear 7 is loose on the shaft 1, and meshing with the gear 7 is a pinion 10, which is adapted to be continuously driven from any suitable source and to continuously drive the gear 7, carrying the 7D toothed wheel 6.

V11 is an operating-rod which is connected to one end of the trip-lever 12, pivoted upon a bracket 13, projecting out from the side of a standard or frame 111, in which the shaft 1 75 is shown as mounted. The other end of the lever 12 is provided with a notch 15, which is adapted to engage one end of an arm 16.

l17 is a spring which tends to hold the triplever 12 in position to engage the end of the 80 arm 16.

18 is what I term the clutch-lever. This lever is pivoted at 19 in a suitable bracket extending out from the frame and carries the clutch-block 20. This clutch-block, Fig. 6, is provided with pins 21, which engage holes bored in the lever 18. Between the block and a shoulder formed on the lever into which the pins project are placed cushioning-pads of leather or similar material 22 for the purpose 90 of taking up the jar incident to stopping the shaft. The clutch-block 2O is held in the lever 18 by means of the dovetail 23. The back face of this dovetail is provided with a slot 24, which is adapted to be engaged by the end of a screw 25 to limit the movement of the block on the lever. I

I will now refer specifically to Figs. 6 and 7, which are detail views of the clutch-block and bolt, respectively. The bolt 5 is formed with roo a beveled end 27 of a shape to engage the notches between the teeth of the toothed wheel 6 to lock the parts of the clutch together. One of the sides of the bolt is provided with a tongue 26, which works in a suitable way and guides the bolt in its radial movement in the disk. From one of the edges of the bolt projects an extension on which several cam-surfaces are formed. The beveled faces 28 and 29 of the projection meet, and the corner is rounded off to form a camsurface 30. The face 29 and the end of the projection meet to form another cam-surface 31, and the top face of the projection is beveled for the purpose of providing clearance. The cam-surface 30 is adapted to engage the cam-surface 32 on the clutch-block 2O for the purpose of lifting the bolt 5 out of engagement with the toothed wheel to disengage the parts of the clutch. 33 is a continuation of the cam-surface 32, the cam-surface 33 being` curved, so -that after the cam-surface 30 has ridden up the surface 32 and reaches the surface 33 the increasing steepness of the surface 33 will gradually stop the bolt and the disk carrying the bolt without shock or jar to the mechanism. Mounted in a suitable part of the frame is a plug 34, which is held against the end 35 of the lever 18 by the spring 36. The plug is shown as made hollow, and one end of the spring is inserted in the bore of the plug, while the other end is held in the bore of a hollow screw 37. By means of this hollow screw the tension of the spring 36 may be adjusted as desired. As will be clearly seen from the drawings, the spring 36, acting through the plug 34, will when the trip-lever 12 is released swing the lever 18 out until the end 35 of the lever strikes the adjustment-stop 38, which movement will swing the block 20 clear of the bolt 5 and will cause the bolt to be forced, by means of a spring 39, into engagement with the teeth of the toothed wheel 6. The ilange 4 on one end ofthe hub 2 has on its inner surface the shearing-cam described, which is adapted to engage a corresponding cam-surface 40, carried by the lever 18, and force the lever back into position to be engaged by the triplever 12 against the tension of the spring 36. The iiange 4 is cut away, as most clearly shown in Fig. 1,to allow the lever to be thrown out and to remain out until the clutch-bolt is entirely clearvof the block on the lever. The lever is then returned by means of the cam on thetlange, when the end of the lever will be engaged by the trip-lever 12 in time for the block to catch the bolt and lift it out of engagement by the cam-surfaces 32 and 33, as has been described. In order to hold the parts in a position to prevent the bolt from engaging the toothed wheel 6 until the lever 1.8 is again thrown out, I provide the block with a catch or hook 41, and this hook is provided with a cam-surface 42, which is adapted to engage the edge 31 of the bolt 5. This will force the lever 18 away from the disk 3. In order to allow for this movement without disengaging the`end'16 of the lever 18 from the trip-lever 12, I have provided the end of the lever 18 with the arm 16, which is pivoted at 43 to the lever 18. Thelever 18 is provided with a hub 44, in which there is guided a plunger 45, having a shoulder 46, against which rests one end of the spring 47, the other end of the spring engaging the end of a screw 48, which passes into the hub. rlhe screw 48 is bored out to allow the end of the plunger 45 to move therein. The head of the plunger 45 rests against the end 49 of the arm 16. By this construction it will be seen that when the lever 18 is forced back by the edge 31 striking the cam-surface 42 cf the hook 41 the lever 18, carrying the block, will be moved away from the disk 3 and will allow the bolt to pass beyond the hook 41. The cam-surfaces 32, 33, and 28 are beveled ed, as most clearly shown in Figs. 16 and 17, in order that when the block is forced clear under the bolt in the position shown in Fig. 17 there will be a sufficient clearance between the bolt 5 and the teeth of the wheel 6.

Having now fully described the construction of the clutch, I will, by reference to Figs. 8 to 17, inclusive, describe the operation and relative position of the clutch parts during the operation ofdisengaging the bolt from the toothed wheel. In Fig. 8 the camsurface 30 of the bolt is shown as-just start# ing up the cam-'surface 32 and the cam-surface 31 has just made contact with the camsurface 42 and the lever 18 has just started to move away from the face of the disk 3. In

Figs. 9 and 10 the bolt is shown in the position it occu pies just as it reaches theend ofthe cam-surface on the hook 41 and the parts are in position when they are ready tomove to the position shown in Figs. 11 and 12, the parts being forced from the position shown in Figs. 9 and 10 to that shown in Figs. 11 and 12 by the spring 47,and by means of the bevel on the cam-surface 32 this movement will lift the bolt clear of the teeth of the wheel 6 in the manner shown in Figs. 16 and 17. Should the momentum of the parts be such that the shaft will not stop at the, instant the bolt is disengaged from the teeth of the wheel 6, but the disk carrying the bolt move beyond this position, the parts may come to rest in the position shown in Fig. 13 and the bolt rest upon the part of the camsurface 33 which has a very much less angle than the angle of the cam-surface 32. Should the momentum be sufficiently great to carry the bolt by this position, then the bolt will ride upon the part of the cam-surface 33 which is of increasing steepness and may come into contact with the vertical portion of the cam-surface and come to rest in the position shown in Figs. 14 and 15 or somewhere between this position and the position shown in Fig. 13. Should, however, the mo- IIO mentum be so great that the increasing steepness of the cam-surface 33 will not be sufficient to stop the rotation. of the shaft and the bolt come into contact with the vertical portion of the cam-surface 33, as shown in Figs. I4 and l5, with suiicient force to re` bound, the parts will be prevented from rebounding too far by means of the hook 4l.

While I have described what I believe to be the preferred form of my invention, I desire to have it understood that I am not to be limited to the exact form and construction of parts which I have shown and described, as many modifications may be made therein without departing from the spirit of my invention.

What I claim as new is- 1. In a clutch, the combination with a shaft of a power-driven wheel loose on the shaft, means to drive the wheel, a series of teeth carried by the wheel, a disk fast on the shaft, a bolt mounted on the disk and adapted to engage the teeth on the wheel, a projection on the bolt extending beyond the face of the disk, a lever provided with means to engage the bolt and lift it out of engagement with the teeth on the wheel, a hook on the lever adjacent to the bolt-lifting means, and a yielding port-ion on the lever whereby the lever will yield when the projection on the bolt passes the hook.

2. In a clutch, the combination with a shaft of a power-driven wheel loose on the shaft, means to drive the wheel, a series of teeth carried bythe wheel, a disk fast on the shaft, a bolt mounted on the disk and adapted to engage the teeth on the wheel, a pivoted lever adapted to swing toward and away from the face of the disk, a cam-surface carried by the lever, a spring tending to move the lever away from the face of the disk, and means adapted to engage the lever and move the same against the face of the disk, and acatch adapted to hold the lever against the face of the disk, whereby the cam portion of the lever will engage the bolt and lift it ut of engagement with the teeth on the wheel.

3. In a clutch, the combination with ashaft of a power-driven wheel loose on the shaft, means to drive the wheel, a series of teeth carried by the wheel, the disk fast on the shaft, a bolt mounted on the disk and adapted to engage the teeth on the wheel, a pivoted lever adapted to swing toward and away from the face of the disk, a spring tending to move the lever away from the face of the disk, means adapted to engage the lever and move the same against the face of the disk, and a catch adapted to hold the lever against the face of the disk,whereby the lever will engage the bolt and lift it out of engagement with the teeth on the wheel.

4. In a clutch,the combination with ashaft, of a power-driven wheel loose on the shaft, means to drive the wheel, a series of teeth carried by the wheel, a disk fast on the shaft, a bolt mounted in the disk and adapted to engage the teeth on the wheel, a projection on the bolt extending beyond the face of the disk, a lever provided with a cam surface adapted to engage with the bolt and lift it out of engagement with the teeth on the wheel, a hook on the lever adjacent to the cam-face and a yielding portion in the lever whereby the lever will yield when the projection on the bolt passes the hook.

5. In a clutch, the combination with ashaft, of a power-driven wheel loose on the shaft, means to drive the wheel, a series of teeth carried by the wheel, a disk fast on the shaft, a bolt mounted in the disk and adapted to engage the teeth on the wheel, a pivoted 1ever adapted to swing toward and away from the face of the disk, av spring tending to move the lever away from the face of the disk, a cam adapted to engage the lever and move the same against the face of the disk and a catch adapted to hold the lever against the face of the disk whereby the lever will en-v gage the bolt and lift it out of engagement with the teeth on the wheel.

6. In aclutch, the combination with ashaft, of a power-driven wheel loose on the shaft, means to drive the wheel, a series of teeth carried by the wheel, a disk fast on the shaft, a bolt mounted in the disk and adapted to engage the teeth on the wheel, a projection on the bolt extending beyond the face of the disk, a lever provided with an inclined camface and adapted to be thrown into position where it will engage the projection on the bolt to lift the bolt out of engagement with the teeth on the wheel, a curved cam-face part of which is substantially vertical to the base of the incline adjacent to the inclined cam-face and adapted to gradually stop the disk by the bolt riding up the curved portion and against the vertical portion, whereby the disk is stopped.

Signed by me at New York,county and State of New York, this 20th day of April, 1903.

CARL L. GROHMANN.

Witnesses:

DAVID M. EDsALL, WENDELL P. BARKER. 

